Now, a toxicology report obtained by AP details the high level of the drug in his system – which Dr. Lewis Nelson, chairman of emergency medicine at Rutgers New Jersey Medical School, described as “a pretty clear smoking gun”.

“The amount in his blood is exceedingly high, even for somebody who is a chronic pain patient on fentanyl patches,” said Dr Nelson.

Prince in 2015

The concentration of fentanyl in Prince’s blood was 67.8 micrograms per litre, with it claimed that just three to 58 micrograms per litre has previously been found to be fatal. Prince was also found to have 450 micrograms per kilogram of the drug in his liver, while liver concentrations greater than 69 micrograms per kilogram “seem to represent overdose or fatal toxicity cases”. He was also said to have had a “potentially” lethal amount of fentanyl in his stomach.

Meanwhile, the lead prosecutor investigating the music icon’s death said that he is currently reviewing reports and would make a decision on whether to charge anyone in relation to his death “in the near future”.

Lenka Paris, Prince’s DJ, wrote in a now-deleted Facebook post that the late icon had played her the synth line before his death. Describing it as “so futuristic and so good”, Paris said: “Last night I hear Janelle Monae’s new song. As soon as the synth came in, I went, ‘Oh shit! That’s it!’ He gave that to her.”

“I wouldn’t be as comfortable with who I am if it had not been for Prince,” she said. “I mean, my label Wondaland would not exist without Paisley Park coming before us. He would probably get me for cussin’, but Prince is in that ‘free motherfucker’ category. That’s the category when we can recognise in each other that you’re also a free motherfucker.

“Whether we curse or not, we see other free motherfuckers. David Bowie! A free motherfucker. I feel their spirit, I feel their energy. They were able to evolve. You felt that freedom in them.”